*
* SMP support for the SuperH processors.
*
- * Copyright (C) 2002, 2003 Paul Mundt
+ * Copyright (C) 2002 - 2007 Paul Mundt
+ * Copyright (C) 2006 - 2007 Akio Idehara
*
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License as published by the
- * Free Software Foundation; either version 2 of the License, or (at your
- * option) any later version.
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
*/
-
#include <linux/err.h>
#include <linux/cache.h>
#include <linux/cpumask.h>
#include <linux/delay.h>
#include <linux/init.h>
-#include <linux/interrupt.h>
#include <linux/spinlock.h>
-#include <linux/threads.h>
+#include <linux/mm.h>
#include <linux/module.h>
-#include <linux/time.h>
-#include <linux/timex.h>
-#include <linux/sched.h>
-#include <linux/module.h>
-
+#include <linux/interrupt.h>
#include <asm/atomic.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/mmu_context.h>
#include <asm/smp.h>
+#include <asm/cacheflush.h>
+#include <asm/sections.h>
-/*
- * This was written with the Sega Saturn (SMP SH-2 7604) in mind,
- * but is designed to be usable regardless if there's an MMU
- * present or not.
- */
-struct sh_cpuinfo cpu_data[NR_CPUS];
-
-extern void per_cpu_trap_init(void);
+int __cpu_number_map[NR_CPUS]; /* Map physical to logical */
+int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */
cpumask_t cpu_possible_map;
EXPORT_SYMBOL(cpu_possible_map);
cpumask_t cpu_online_map;
EXPORT_SYMBOL(cpu_online_map);
-static atomic_t cpus_booted = ATOMIC_INIT(0);
-
-/* These are defined by the board-specific code. */
-
-/*
- * Cause the function described by call_data to be executed on the passed
- * cpu. When the function has finished, increment the finished field of
- * call_data.
- */
-void __smp_send_ipi(unsigned int cpu, unsigned int action);
-
-/*
- * Find the number of available processors
- */
-unsigned int __smp_probe_cpus(void);
-
-/*
- * Start a particular processor
- */
-void __smp_slave_init(unsigned int cpu);
-
-/*
- * Run specified function on a particular processor.
- */
-void __smp_call_function(unsigned int cpu);
static inline void __init smp_store_cpu_info(unsigned int cpu)
{
- cpu_data[cpu].loops_per_jiffy = loops_per_jiffy;
+ struct sh_cpuinfo *c = cpu_data + cpu;
+
+ c->loops_per_jiffy = loops_per_jiffy;
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
unsigned int cpu = smp_processor_id();
- int i;
- atomic_set(&cpus_booted, 1);
- smp_store_cpu_info(cpu);
-
- for (i = 0; i < __smp_probe_cpus(); i++)
- cpu_set(i, cpu_possible_map);
+ init_new_context(current, &init_mm);
+ current_thread_info()->cpu = cpu;
+ plat_prepare_cpus(max_cpus);
+
+#ifndef CONFIG_HOTPLUG_CPU
+ cpu_present_map = cpu_possible_map;
+#endif
}
void __devinit smp_prepare_boot_cpu(void)
{
unsigned int cpu = smp_processor_id();
+ __cpu_number_map[0] = cpu;
+ __cpu_logical_map[0] = cpu;
+
cpu_set(cpu, cpu_online_map);
cpu_set(cpu, cpu_possible_map);
}
-int __cpu_up(unsigned int cpu)
+asmlinkage void __cpuinit start_secondary(void)
{
- struct task_struct *tsk;
+ unsigned int cpu;
+ struct mm_struct *mm = &init_mm;
- tsk = fork_idle(cpu);
+ atomic_inc(&mm->mm_count);
+ atomic_inc(&mm->mm_users);
+ current->active_mm = mm;
+ BUG_ON(current->mm);
+ enter_lazy_tlb(mm, current);
+
+ per_cpu_trap_init();
- if (IS_ERR(tsk))
- panic("Failed forking idle task for cpu %d\n", cpu);
-
- task_thread_info(tsk)->cpu = cpu;
+ preempt_disable();
+
+ local_irq_enable();
+
+ calibrate_delay();
+
+ cpu = smp_processor_id();
+ smp_store_cpu_info(cpu);
cpu_set(cpu, cpu_online_map);
- return 0;
+ cpu_idle();
}
-int start_secondary(void *unused)
+extern struct {
+ unsigned long sp;
+ unsigned long bss_start;
+ unsigned long bss_end;
+ void *start_kernel_fn;
+ void *cpu_init_fn;
+ void *thread_info;
+} stack_start;
+
+int __cpuinit __cpu_up(unsigned int cpu)
{
- unsigned int cpu;
+ struct task_struct *tsk;
+ unsigned long timeout;
- cpu = smp_processor_id();
+ tsk = fork_idle(cpu);
+ if (IS_ERR(tsk)) {
+ printk(KERN_ERR "Failed forking idle task for cpu %d\n", cpu);
+ return PTR_ERR(tsk);
+ }
- atomic_inc(&init_mm.mm_count);
- current->active_mm = &init_mm;
+ /* Fill in data in head.S for secondary cpus */
+ stack_start.sp = tsk->thread.sp;
+ stack_start.thread_info = tsk->stack;
+ stack_start.bss_start = 0; /* don't clear bss for secondary cpus */
+ stack_start.start_kernel_fn = start_secondary;
- smp_store_cpu_info(cpu);
+ flush_cache_all();
- __smp_slave_init(cpu);
- preempt_disable();
- per_cpu_trap_init();
-
- atomic_inc(&cpus_booted);
+ plat_start_cpu(cpu, (unsigned long)_stext);
- cpu_idle();
- return 0;
+ timeout = jiffies + HZ;
+ while (time_before(jiffies, timeout)) {
+ if (cpu_online(cpu))
+ break;
+
+ udelay(10);
+ }
+
+ if (cpu_online(cpu))
+ return 0;
+
+ return -ENOENT;
}
void __init smp_cpus_done(unsigned int max_cpus)
{
- smp_mb();
+ unsigned long bogosum = 0;
+ int cpu;
+
+ for_each_online_cpu(cpu)
+ bogosum += cpu_data[cpu].loops_per_jiffy;
+
+ printk(KERN_INFO "SMP: Total of %d processors activated "
+ "(%lu.%02lu BogoMIPS).\n", num_online_cpus(),
+ bogosum / (500000/HZ),
+ (bogosum / (5000/HZ)) % 100);
}
void smp_send_reschedule(int cpu)
{
- __smp_send_ipi(cpu, SMP_MSG_RESCHEDULE);
+ plat_send_ipi(cpu, SMP_MSG_RESCHEDULE);
}
static void stop_this_cpu(void *unused)
void smp_send_stop(void)
{
- smp_call_function(stop_this_cpu, 0, 1, 0);
+ smp_call_function(stop_this_cpu, 0, 0);
}
+void arch_send_call_function_ipi(cpumask_t mask)
+{
+ int cpu;
-struct smp_fn_call_struct smp_fn_call = {
- .lock = SPIN_LOCK_UNLOCKED,
- .finished = ATOMIC_INIT(0),
-};
+ for_each_cpu_mask(cpu, mask)
+ plat_send_ipi(cpu, SMP_MSG_FUNCTION);
+}
+
+void arch_send_call_function_single_ipi(int cpu)
+{
+ plat_send_ipi(cpu, SMP_MSG_FUNCTION_SINGLE);
+}
+
+/* Not really SMP stuff ... */
+int setup_profiling_timer(unsigned int multiplier)
+{
+ return 0;
+}
+
+static void flush_tlb_all_ipi(void *info)
+{
+ local_flush_tlb_all();
+}
+
+void flush_tlb_all(void)
+{
+ on_each_cpu(flush_tlb_all_ipi, 0, 1);
+}
+
+static void flush_tlb_mm_ipi(void *mm)
+{
+ local_flush_tlb_mm((struct mm_struct *)mm);
+}
/*
- * The caller of this wants the passed function to run on every cpu. If wait
- * is set, wait until all cpus have finished the function before returning.
- * The lock is here to protect the call structure.
- * You must not call this function with disabled interrupts or from a
- * hardware interrupt handler or from a bottom half handler.
+ * The following tlb flush calls are invoked when old translations are
+ * being torn down, or pte attributes are changing. For single threaded
+ * address spaces, a new context is obtained on the current cpu, and tlb
+ * context on other cpus are invalidated to force a new context allocation
+ * at switch_mm time, should the mm ever be used on other cpus. For
+ * multithreaded address spaces, intercpu interrupts have to be sent.
+ * Another case where intercpu interrupts are required is when the target
+ * mm might be active on another cpu (eg debuggers doing the flushes on
+ * behalf of debugees, kswapd stealing pages from another process etc).
+ * Kanoj 07/00.
*/
-int smp_call_function(void (*func)(void *info), void *info, int retry, int wait)
+
+void flush_tlb_mm(struct mm_struct *mm)
{
- unsigned int nr_cpus = atomic_read(&cpus_booted);
- int i;
+ preempt_disable();
- if (nr_cpus < 2)
- return 0;
+ if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
+ smp_call_function(flush_tlb_mm_ipi, (void *)mm, 1);
+ } else {
+ int i;
+ for (i = 0; i < num_online_cpus(); i++)
+ if (smp_processor_id() != i)
+ cpu_context(i, mm) = 0;
+ }
+ local_flush_tlb_mm(mm);
+
+ preempt_enable();
+}
- /* Can deadlock when called with interrupts disabled */
- WARN_ON(irqs_disabled());
+struct flush_tlb_data {
+ struct vm_area_struct *vma;
+ unsigned long addr1;
+ unsigned long addr2;
+};
- spin_lock(&smp_fn_call.lock);
+static void flush_tlb_range_ipi(void *info)
+{
+ struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
- atomic_set(&smp_fn_call.finished, 0);
- smp_fn_call.fn = func;
- smp_fn_call.data = info;
+ local_flush_tlb_range(fd->vma, fd->addr1, fd->addr2);
+}
- for (i = 0; i < nr_cpus; i++)
- if (i != smp_processor_id())
- __smp_call_function(i);
+void flush_tlb_range(struct vm_area_struct *vma,
+ unsigned long start, unsigned long end)
+{
+ struct mm_struct *mm = vma->vm_mm;
- if (wait)
- while (atomic_read(&smp_fn_call.finished) != (nr_cpus - 1));
+ preempt_disable();
+ if ((atomic_read(&mm->mm_users) != 1) || (current->mm != mm)) {
+ struct flush_tlb_data fd;
+
+ fd.vma = vma;
+ fd.addr1 = start;
+ fd.addr2 = end;
+ smp_call_function(flush_tlb_range_ipi, (void *)&fd, 1);
+ } else {
+ int i;
+ for (i = 0; i < num_online_cpus(); i++)
+ if (smp_processor_id() != i)
+ cpu_context(i, mm) = 0;
+ }
+ local_flush_tlb_range(vma, start, end);
+ preempt_enable();
+}
- spin_unlock(&smp_fn_call.lock);
+static void flush_tlb_kernel_range_ipi(void *info)
+{
+ struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
- return 0;
+ local_flush_tlb_kernel_range(fd->addr1, fd->addr2);
}
-/* Not really SMP stuff ... */
-int setup_profiling_timer(unsigned int multiplier)
+void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
- return 0;
+ struct flush_tlb_data fd;
+
+ fd.addr1 = start;
+ fd.addr2 = end;
+ on_each_cpu(flush_tlb_kernel_range_ipi, (void *)&fd, 1);
+}
+
+static void flush_tlb_page_ipi(void *info)
+{
+ struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
+
+ local_flush_tlb_page(fd->vma, fd->addr1);
}
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
+{
+ preempt_disable();
+ if ((atomic_read(&vma->vm_mm->mm_users) != 1) ||
+ (current->mm != vma->vm_mm)) {
+ struct flush_tlb_data fd;
+
+ fd.vma = vma;
+ fd.addr1 = page;
+ smp_call_function(flush_tlb_page_ipi, (void *)&fd, 1);
+ } else {
+ int i;
+ for (i = 0; i < num_online_cpus(); i++)
+ if (smp_processor_id() != i)
+ cpu_context(i, vma->vm_mm) = 0;
+ }
+ local_flush_tlb_page(vma, page);
+ preempt_enable();
+}
+
+static void flush_tlb_one_ipi(void *info)
+{
+ struct flush_tlb_data *fd = (struct flush_tlb_data *)info;
+ local_flush_tlb_one(fd->addr1, fd->addr2);
+}
+
+void flush_tlb_one(unsigned long asid, unsigned long vaddr)
+{
+ struct flush_tlb_data fd;
+
+ fd.addr1 = asid;
+ fd.addr2 = vaddr;
+
+ smp_call_function(flush_tlb_one_ipi, (void *)&fd, 1);
+ local_flush_tlb_one(asid, vaddr);
+}
git.samba.org / sfrench / cifs-2.6.git / blobdiff